22537409 has 2 divisors, whose sum is σ = 22537410. Its totient is φ = 22537408.

The previous prime is 22537399. The next prime is 22537423. The reversal of 22537409 is 90473522.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17247409 + 5290000 = 4153^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 22537409 - 2⁸ = 22537153 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22537499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11268704 + 11268705.

It is an arithmetic number, because the mean of its divisors is an integer number (11268705).

Almost surely, 2^22537409 is an apocalyptic number.

It is an amenable number.

22537409 is a deficient number, since it is larger than the sum of its proper divisors (1).

22537409 is an equidigital number, since it uses as much as digits as its factorization.

22537409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 22537409 is about 4747.3581074109. The cubic root of 22537409 is about 282.4671807751.

The spelling of 22537409 in words is "twenty-two million, five hundred thirty-seven thousand, four hundred nine".